The bone of its foreleg, or the bone of its hind leg, was broken, although it is not discernible.  The aforementioned blemishes were enumerated by Ayala in Yavneh, and the Sages concurred with him. He [also] added another three; [but] they said to him: We have not heard of these.  [These are:] The circle of its eye is round like that of a man, or its mouth resembles that of a pig, or the greater part of its fore-tongue is gone. However, a subsequent beis din said: These are [indeed] blemishes.

It happened that the lower jaw [of an animal] protruded beyond its upper jaw; Rabban Shimon ben Gamliel sent to the Sages, and they said: It is a blemish. [If] a kid’s ear was doubled —- the Sages said: In the instance that it is one body, it is a blemish; but if it is not one body, it is not a blemish. R’ Chanania ben Gamliel says: A kid’s tail that resembles that of a pig, or [a tail] that does not have three vertebrae, is a blemish.